单项选择题

A scientist usually directs his attention towards problems which he notices have no satisfactory explanation, and his curiosity makes him look for______ relationship even if the data available seem to be unconnected.

A．underlining
B．underneath
C．undergoing
D．underlying
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单项选择题
Once he starts talking about Chinese or foreign affairs, ancient or modern______ .
A．there is no stopping of him
B．he is not to stop
C．there is no stopping him
D．it is no stopping him
单项选择题
He was______ for military service at the age of eighteen and spent a year in the army.
A．called in
B．sent out
C．called up
D．taken on
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